rust/tests/ui/from_iter_instead_of_collect.rs

// run-rustfix

#![warn(clippy::from_iter_instead_of_collect)]
#![allow(unused_imports)]

use std::collections::{BTreeMap, BTreeSet, HashMap, VecDeque};
use std::iter::FromIterator;

fn main() {
    let iter_expr = std::iter::repeat(5).take(5);
    let _ = Vec::from_iter(iter_expr);

    let _ = HashMap::<usize, &i8>::from_iter(vec![5, 5, 5, 5].iter().enumerate());

    Vec::from_iter(vec![42u32]);

    let a = vec![0, 1, 2];
    assert_eq!(a, Vec::from_iter(0..3));

    let mut b = VecDeque::from_iter(0..3);
    b.push_back(4);

    let values = [(0, 'a'), (1, 'b'), (2, 'c'), (3, 'd')];
    let bm = BTreeMap::from_iter(values.iter().cloned());
    let mut bar = BTreeMap::from_iter(bm.range(0..2));
    bar.insert(&4, &'e');

    let mut bts = BTreeSet::from_iter(0..3);
    bts.insert(2);
    {
        use std::collections;
        let _ = collections::BTreeSet::from_iter(0..3);
    }
}